Oracle transaction reconciliation fails to lookup primary key columns if UPDATE sets columns to only NULL

{"connector.class": "io.debezium.connector.oracle.OracleConnector", 
"tasks.max": "1", 
"snapshot.mode": "schema_only", 
"snapshot.delay.ms": "5000", 
"heartbeat.interval.ms": "1000", 
"provide.transaction.metadata": "true", 
"decimal.handling.mode": "string",
"sanitize.field.names": "true",
"event.processing.failure.handling.mode": "skip", 
"database.server.name": "ABCDf2", 
"database.hostname": "192.168.2.68", 
"database.port": "1521", 
"database.user": "logminer", 
"database.password": "lm", 
"database.dbname": "ABCDf2",  
"database.history.kafka.bootstrap.servers": "10.204.192.111:9092,10.204.192.112:9092,10.204.192.113:9092", 
"database.history.kafka.topic": "history_logminer_160621_v0",
"log.mining.archive.log.hours": "1",
"log.mining.archive.log.only.mode": "true",
"table.include.list": "ABCD_SHARD_1_3.D_LOT_VERSION,ABCD_SHARD_1_3.D_LOT_ENTITY,ABCD_SHARD_1_3.D_LOT_STATUS_HISTORY,ABCD_SHARD_1_3.D_PROCEDURE_LOT_ENTRY,ABCD_SHARD_1_3.D_LOT_LOT_ENTRY,ABCD_SHARD_1_3.D_PROCEDURE_VERSION,ABCD_SHARD_1_3.D_PROCEDURE_ENTITY,ABCD_SHARD_1_3.D_PLAN_SCHEDULE_LOT_ENTRY,ABCD_SHARD_1_3.D_PLAN_SCHEDULE_VERSION,ABCD_SHARD_1_3.D_PLAN_SCHEDULE_ENTITY,ABCD_SHARD_1_3.D_BID,ABCD_SHARD_1_3.D_EA_PARTICIPANT,ABCD_SHARD_1_3.D_LOT_LOTNUM_ENTRY,ABCD_NSI.N_SPGZ,ABCD_NSI.N_CHARACTERISTIC_SPGZ,ABCD_NSI.N_SPGZ_CHARACTERISTIC_SPGZ,ABCD_NSI.N_CHARACTERISTIC_SPGZ_ENUM,ABCD_NSI.N_KPGZ,ABCD_NSI.N_CHARACTERISTIC_KPGZ,ABCD_NSI.N_KPGZ_CHARACTERISTIC_KPGZ,ABCD_NSI.N_CHARACTERISTIC_KPGZ_ENUM,ABCD_NSI.N_KPGZ_CONTRACT_TEMPLATE,ABCD_NSI.N_KPGZ_TECH_TASK,ABCD_NSI.N_CHARACTERISTIC,ABCD_NSI.N_OKEI_SPGZ" }

-- auto-generated definition
create table D_PLAN_SCHEDULE_VERSION
(
    ID                               NUMBER(38) not null
        constraint PK_SPLAN_VERSION_ID
            primary key,
    ENTITY_ID                        NUMBER(38) not null
        constraint FK_PSV_PLAN_SCHEDULE_ENTITY
            references D_PLAN_SCHEDULE_ENTITY,
    CREATED_DATE                     TIMESTAMP(6),
    DELETED_DATE                     DATE,
    PUBLICATION_DATE                 DATE,
    APPROVED_VERSION                 NUMBER(38),
    ACTUAL                           NUMBER(1),
    REASON_FOR_CHANGE_ID             NUMBER(38),
    GRBS_APPROVED_SENT_DATE          DATE,
    GRBS_APPROVED_DATE               DATE,
    GRBS_RESULT_OF_REVIEW_ID         NUMBER(38),
    OPERATION_ID                     NVARCHAR2(50),
    APPROVED_DATE                    DATE,
    DOCX                             BLOB,
    DOCX_SIGNATURE                   BLOB,
    XML_OOS                          BLOB,
    XML_OOS_SIGNATURE                BLOB,
    SIGNER_USER_ID                   NUMBER(38),
    DOCX_FILE_ACCESS_CODE            NVARCHAR2(50),
    OOS_XML_FILE_ACCESS_CODE         NVARCHAR2(50),
    OOS_REF_ID                       NVARCHAR2(50),
    OOS_USER                         VARCHAR2(50),
    OOS_PASSWORD                     VARCHAR2(50),
    VERSION                          NUMBER(10) default 1,
    STATUS_ID                        NUMBER(10),
    DF_REQUEST_ID                    NUMBER(38),
    DF_RESULT_OF_REVIEW_ID           NUMBER(38),
    DF_APPROVED_DATE                 DATE,
    DF_APPROVED_SENT_DATE            DATE,
    YEAR_SUM                         NUMBER(19, 2),
    FO_APPROVAL_RECEIVED             NUMBER(1),
    PRINT_FORM_FILE_ID               NUMBER(10),
    EXCLUDED_PURCHASE_VOLUME         NUMBER,
    PLANNED_PURCHASE_VOLUME          NUMBER,
    AGGREGATE_ANNUAL_CONTR_VALUE     NUMBER,
    ANNUAL_MSP_PURCHASE_VOLUME       NUMBER,
    ANNUAL_ONLY_MSP_PURCHASE_VOL     NUMBER,
    SPGZ_INNOVATION_SUM              NUMBER,
    PLANNED_ONLY_MSP_PURCHASE_VOLUME NUMBER,
    OOS_VERSION                      NUMBER(10)
)
/
create index PLAN_SCHEDULE_VERSION_ENT_ID
    on D_PLAN_SCHEDULE_VERSION (ENTITY_ID)
/